Added FORCE* targets for ans2asc and asc2ans for use by the depend target

src/sbbs3/GNUmakefile

@@ -555,11 +555,15 @@ $(JSEXEC): $(JSEXEC_OBJS)
 	$(QUIET)$(CCPP) $(UTIL_LFLAGS) -o $@ $^ $(LFLAGS)
 	
 # ANS2ASC
+FORCE$(ANS2ASC): $(LIBODIR)/ans2asc.o
+
 $(ANS2ASC): $(LIBODIR)/ans2asc.o
 	@echo Linking $@
 	$(QUIET)$(CC) $(UTIL_LFLAGS) -o $@ $^
 
 # ASC2ANS
+FORCE$(ASC2ANS): $(LIBODIR)/asc2ans.o
+
 $(ASC2ANS): $(LIBODIR)/asc2ans.o
 	@echo Linking $@
 	$(QUIET)$(CC) $(UTIL_LFLAGS) -o $@ $^